It is very convenient when a door or a wicket latches on itself when it is closed. To do this, there are many designs of locks on sale, but none of them can boast such reliability as the proposed home-made latch. It is a fail-safe system that can last for decades.
- Rebar 6-8 mm;
- strip 40×6 mm;
- bolts М8-М10.
Wide-use welding electrodes on Aliexpress at a discount – http://alii.pub/606j2h
Automatic latch making process
The first step is to mechanically clean the reinforcement from rust.
To make a latch of this design, it is necessary to bend the locking bracket from the reinforcement. For this, it is desirable to have a vice. With their help, the edge of the reinforcement is bent 180 degrees.
The resulting inflection must be narrowed. To do this, he is squeezed in a vice. A strip is inserted between the reinforcement to keep a small gap at the bend.
The long bar of the workpiece must be bent in the opposite direction already at a right angle relative to the first bend. You should get a tongue that is longer than the width of the strip selected for the latch.
Next, you need to wind a loop at the long end of the reinforcement opposite the first bend. Here, the metal will need to be heated. The bend is made around an M10 bolt inserted into the hole in the strip. The excess length of the reinforcement is cut off, you need to form an eyelet.
A workpiece is cut from the strip with a hole used to bend the locking bracket. A bracket is installed on it using an axle made of a turned head bolt.
A fastener from a strip segment with holes along the edges is welded to the workpiece. It is important that the distance from the edge of the bracket to the attachment is a couple of millimeters greater than the thickness of the existing strip. A machined bolt is also welded in, but so that the bracket can rotate freely.
A T-shaped counterpart is made from two sections of the strip. One of them will serve as a pin for fixing the bracket, and the second for attaching to a door frame or a wicket post. Parts can be welded together, or tightened with turned head bolts. In the second case, it will look more aesthetically pleasing.
We fasten the bracket to the door, and the counterpart to the box or post.
When closed, the bracket rises by itself, and then falls, blocking the pin. The door can be opened by lifting it. The bend at the bottom of the bracket allows the padlock to engage, completely blocking the mechanism.